JP4095812B2 - Compressor and maintenance method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  In particular, the present invention belongs to a technical field of a compressor and a maintenance method thereof, in which each of a plurality of maintenance required parts can be maintained at an appropriate time.
[0002]
[Prior art]
  A compressor, particularly an oil-cooled screw compressor that uses oil for shaft sealing, lubrication, cooling, and the like, includes many parts that require maintenance (hereinafter referred to as maintenance parts that are required). For example, the suction filter, the oil separation element, the oil filter, the oil itself, and the like correspond to the maintenance required components. The maintenance time of each of the maintenance components required varies depending on the use state of the compressor and the like, but in reality, maintenance is performed periodically.
[0003]
[Problems to be solved by the invention]
  Maintenance parts such as the compressor suction filter, oil separation element, oil filter, electric motor that drives the compressor main body, and oil itself are different depending on the use state of the compressor as described above. It is regularly maintained. If the maintenance-required parts of the compressor are regularly maintained, maintenance is also performed on the maintenance-required parts that originally do not require maintenance, resulting in increased waste. For example, in the case where parts are regularly changed uniformly, there is a waste that replacement is required up to maintenance parts that can be used continuously. Such rule making of uniform replacement of parts is preferable for stable operation of the compressor, but is not preferable for its maintenance cost and running cost.
[0004]
  In addition, the maintenance of the essential maintenance parts of the compressor is indispensable for the compressor. If proper maintenance cannot be performed on the maintenance parts requiring maintenance at the appropriate time, in the worst case, the compressor suddenly stops due to a sudden failure due to the life of the maintenance parts requiring maintenance. It can have a significant impact on the operation and, in turn, the operation of product production lines that use compressed gas.
[0005]
  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a compressor and a maintenance method thereof capable of performing appropriate maintenance at an appropriate time for maintenance parts required for the compressor regardless of the use state of the compressor. It is to be.
[0006]
[Means for Solving the Problems]
  The present invention has been made in view of the above circumstances. Therefore, in order to solve the above problems, the means employed by the compressor according to claim 1 of the present invention includes a compressor body.An oil-cooled compressor having an oil flow path interposing an oil filterIn the compressor, there is provided an operation state amount detecting means for detecting an operation state amount related to the operation state of the compressor, and a predetermined maintenance timing of the maintenance component required based on the operation state amount detected by the operation state amount detection means. An arithmetic means having a function of calculatingThe operating state quantity detection means is a suction thermometer provided on the suction side of the compressor body, a discharge thermometer provided on the discharge side of the compressor body, and an oil supply thermometer provided in the oil passage. The operating state quantity is a suction temperature T detected by the suction thermometer. _s And the discharge temperature T detected by the discharge thermometer _d And an oil supply temperature T detected by the oil supply thermometer ₀ Based on the above, the oil flow rate q of the oil flowing through the oil flow path obtained by the following formula, and the maintenance required component is the oil filterIt is characterized by that.
          Equation qq {W-C ₂ × Q × ( T _d -T _s ) } / {C ₁ × ( T _d -T ₀ ) }
          W, Q, C in the above formula ₁ , C ₂ Is a constant.
[0007]
  Compressor according to claim 2 of the present inventionMaintenance methodThe means adopted by, PressureCompaction machineAnd measuring an operating state quantity related to the operating state of the compressor, which is an oil-cooled compressor having an oil flow path in which an oil filter is interposed, and determining the required maintenance parts based on the measured operating state quantity Compressor maintenance method that determines the maintenance period of the compressorThe operation stateThe amount is a suction temperature T detected by a suction thermometer provided on the suction side of the compressor body. _s And a discharge temperature T detected by a discharge thermometer provided on the discharge side of the compressor body _d And an oil supply temperature T detected by an oil supply thermometer provided in the oil passage. ₀ The oil flow rate q of the oil flowing through the oil flow path determined by the following formula, and the predetermined maintenance is the maintenance of the oil filterIt is characterized by being.
          Equation qq {W-C ₂ × Q × ( T _d -T _s ) } / {C ₁ × ( T _d -T ₀ ) }
          W, Q, C in the above formula ₁ , C ₂ Is a constant.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the schematic configuration of the compressor according to the embodiment for carrying out the maintenance method of the present invention will be described by taking the case where the compressor is an oil-cooled screw compressor (hereinafter referred to as a compressor) as an example. This will be described with reference to FIG.
[0009]
  FIG. 1 shows a compressor according to an embodiment for carrying out the maintenance method of the present invention. This compressor has a compressor body 1 in which a pair of male and female screw rotors (not shown) are built in a rotor casing. It has. An output shaft of the electric motor 2 whose rotational speed is controlled by the inverter 15 is connected to one shaft (usually a male rotor) of the screw rotor via a coupling (not shown). A suction flow path 10 is connected to the suction port 3 of the compressor body 1, and a suction filter 11 that removes foreign matters such as dust contained in the suction air that is the suction gas is connected to the suction flow path 10. Is intervening.
[0010]
  The discharge port 4 of the compressor body 1 is connected to a discharge flow path 12 that communicates with a compressed air supply destination that is a discharge gas supply destination. 5 is interposed. An oil separation element 6 for separating oil from discharge air containing oil discharged from the compressor main body 1 is disposed above the oil separation / recovery unit 5. An oil reservoir 7 for storing the separated oil is formed. The compressed air from which oil has been removed after passing through the oil separation element 4 is configured to be supplied to the compressed air supply destination through the suction flow path 10.
[0011]
  Further, an oil flow path 13 described later communicates from the oil reservoir 7 of the oil separator / collector 5 to the compressor body 1. The oil passage 13 has a cooling fan.14, an oil cooler 8 that is cooled by 4 and an oil filter 9 are interposed, and the oil stored in the oil reservoir 7 is cooled to a predetermined temperature, and sludge and the like are removed to compress the oil. It is supplied to the machine body 1.
  The oil supply points are a compression space (not shown) of the compressor body 1, a shaft seal, a bearing, and the like.
[0012]
  The compressor having such a configuration is configured such that operation is controlled by the compressor control device 20. That is, the compressor control device 20 is disposed on the downstream side of the suction filter 11 in the suction flow path 10, and measures the temperature of the suction air flowing through the suction flow path 10 and the temperature of the electric motor 2. The motor thermometer 25 which detects this is provided. Further, a supply air pressure gauge 23 is provided in the discharge flow path 12 and measures the pressure of the supply air that has passed through the oil separation element 4 and from which oil has been removed. In addition, a discharge air pressure gauge 22 and a discharge air thermometer 24 that are provided in the oil separation and recovery device 5 and measure the pressure and temperature of the discharge air in the oil separation and recovery device 5 are provided. Further, an oil supply thermometer 26 that is disposed on the upstream side of the oil cooler 8 in the oil passage 13 and measures the temperature of the oil flowing through the oil passage is provided. These measuring devices are means for detecting the operating state of the compressor.
[0013]
  And the controller 27 into which the detected value from the said suction air thermometer 21, the discharge air pressure gauge 22, the supply air pressure gauge 23, the discharge air thermometer 24, the motor thermometer 25, and the oil supply thermometer 26 is input is provided. Yes. The controller 27 controls the rotation of the cooling fan 14 in accordance with a signal for controlling the rotation speed of the electric motor 2 to the inverter 15 and a detection value input from the oil supply thermometer 26, that is, the oil temperature. Output a signal for the purpose. Further, the calculation related to the maintenance timing of a plurality of maintenance components to be described later is performed, and the calculation result is displayed on a display means such as a display (not shown). In addition to the display means, the controller 27 may be provided with sound generation means or warning generation means.
[0014]
  The required maintenance parts to be subjected to the calculation related to the maintenance time by the controller 27 are as follows.
  (1)Suction filter (clogged)
  (2)Oil separation element (clogged)
  (3)Oil filter (clogged)
  Hereinafter, the maintenance timing of the maintenance components required by the controller 27 will be described in more detail.
[0015]
  First, for the suction filter (clogging), refer to FIG. 2 for explaining the change in the cooling fan speed with time, with the horizontal axis representing time (h) and the vertical axis representing the cooling fan speed (rpm). While explaining. When the compressor is a package type and the compressor body 1 is an oil-cooled screw compressor, the rotational speed of the cooling fan 14 is controlled while measuring the temperature of the discharge air with the discharge air thermometer 24, The temperature of the discharge air is controlled so that moisture does not condense in the compressed air.
  More specifically, when the temperature of the discharge air is high, the rotation speed of the cooling fan 14 is increased to increase the amount of cooling air. Conversely, when the temperature of the discharge air is low, the rotation speed of the cooling fan 14 is decreased. The cooling air volume is reduced.
[0016]
  If the suction filter 11 is clogged during the above-described control operation of the compressor, the inside of the soundproof cover becomes negative pressure. Therefore, the differential pressure increases between the suction side and the discharge side of the cooling fan 14, the cooling air volume decreases, and the temperature of the discharge air rises. Then, in order to prevent the temperature of the discharge air from rising, the number of rotations of the cooling fan 14 is controlled to be high speed based on the measured temperature output from the discharge air thermometer 24. Therefore, when the rotational speed of the cooling fan 14 increases with time, the suction filter 11 is clogged, so the remaining life of the suction filter 11 is calculated from the rising curve of the rotational speed of the cooling fan 14. can do.
[0017]
  For example, it is assumed that the rotational speed of the cooling fan 14 rises while drawing a rising curve as shown in FIG. The solid line shown in FIG. 2 indicates the actual rotational speed of the cooling fan 14. A broken line indicates a curve estimated by Lagrangian interpolation or the like from a plurality of points in the solid line. In other words, the broken line shows a temporal change in the rotational speed of the cooling fan 14.
[0018]
  By the way, the rotation speed of the cooling fan 14 here is calculated and derived by a calculation unit having a calculation function of the controller 27, and the rotation speed control signal transmitted to the cooling fan 14 is calculated. This is in accordance with the number of rotations made. In the case of the compressor according to this embodiment, a rotational speed detector such as a rotary encoder is not provided in order to minimize the number of parts. However, it is of course possible to employ a method in which the cooling fan 14 is provided with a rotational speed detector such as a rotary encoder and the actual rotational speed of the cooling fan 14 is obtained from the rotational speed signal output from the rotational speed detector. it can.
[0019]
  The controller 27 calculates the maintenance time of the suction filter 11, that is, the replacement time, and displays the necessity of the replacement on a display means such as a display device (not shown). The controller 27 is provided with an input switch (not shown). This input switch is for transmitting to the controller 27 that the maintenance of the suction filter 11 has been completed and the calculation of the next maintenance time is newly started.
[0020]
  That is, when the suction filter 11 is first attached and the operation of the compressor is started, the controller 27 informs the controller 27 that the operation of the maintenance time of the attached suction filter 11 is newly started. Press the input switch to communicate. As a result, the controller 27 newly starts calculating the maintenance time of the suction filter 11. Normally, the suction filter 11 is not removed until it is replaced after being attached. Accordingly, a limit switch is attached to a position adjacent to the frame portion of the suction filter 11, and the controller 27 recognizes that the suction filter 11 has been removed when the limit switch is turned off. May be.
[0021]
  The filter replacement time calculation method 1 will be described. The controller 27 includes a life initial value L of the suction filter 11.₀Is entered. The elapsed time from when the suction filter 11 is replaced (when the input switch is pressed) is t, and the rotational speed of the cooling fan 14 at the time when t time has elapsed is R._tAnd
[0022]
  Here, assuming that the controller 27 has sampled the number of rotations of the cooling fan 14 every unit time of Δt, the elapsed time t until the sampling is performed n times is t = n × Δt. In addition, the life of the suction filter 11 when t time has elapsed is L_tIf this is the case, the life L of the suction filter 11_tIs(1)It can be expressed by a formula.
  L_t= L₀-CΣR_iΔtΔt ‥‥‥‥‥‥(1)
  The above(1)The lowercase letter c in the formula is an arbitrary constant, and the lowercase letter i is an integer from 0 to n.
  the above(1)By calculating the equation, the life L of the suction filter 11_tIs shorter than a predetermined threshold, it is displayed on the display device of the controller 27 that maintenance of the suction filter 11 is necessary.
[0023]
  Next, the filter replacement time calculation method 2 will be described. First, as indicated by a two-dot chain line in FIG. 2, the upper limit value R of the rotation speed of the cooling fan 14 is used as a guide for the life of the suction filter 11._thIs established. The number of rotations of the cooling fan 14 is the upper limit value R_thTime to reach (time when maintenance is required) L_thIs obtained by sampling the number of rotations of the cooling fan 14. The filter replacement time calculation method 2 determines not the life of the suction filter 11 itself but the time when the life of the suction filter 11 is exhausted.
[0024]
  That is, the time when the suction filter 11 is replaced (the time when the input switch is pressed) is set to 0, the elapsed time from the 0 point is set to t, and the rotational speed of the cooling fan 14 at the time when the time t has elapsed is R._tAnd Here, if the controller 27 samples the number of rotations of the cooling fan 14 n times per unit time of Δt, the elapsed time t until the sampling is performed n times is the same as in the case of the filter replacement time calculation method 1 described above. T = n × Δt. In this case,(2),(3)According to the equation, the time L when maintenance of the suction filter 11 is required_thCan be calculated.
[0025]
  L_th= (R_th-R_{( n-1 ) Δt}) × {Δt / (R_nΔt-R_{( n-1 ) Δt})} + (N−1) Δt
                                                      ‥‥‥‥‥‥(2)
  However, the above(2)L in the formula_th≧ L₀L if_th= L₀And then
  R_nΔt≦ R_{( n-1 ) Δt}                                    ‥‥‥‥‥‥(3)
Is used. The above(2)The formula is yR_{( n-1 ) Δt}= {(R_nΔt-R_{( n-1 ) Δt}) / Δt} × {x− (n−1) Δt} where y = R_thIt was obtained by introducing and organizing.
[0026]
  Time L when maintenance of the suction filter 11 is required_thThe above calculation(2)Formula and(3)The expression is used for the following reason. That is, the above formula(2)The required time L for maintenance of the suction filter 11 by the formula alone_thIf we try to derive(3)In Case of,(2)Time L based on the formula_thCannot get a solution of or time L_thThe value of becomes negative. Therefore, in the above case, as described above, the initial value L of the life of the suction filter 11₀L_thAnd then(3)The formula is used.
[0027]
  Therefore, the controller 27 determines the elapsed time t after the replacement of the suction filter 11 and the time L obtained by calculation._thAnd when the difference is smaller than a predetermined threshold value, it is determined that it is the replacement time. As a result, the determination result that “maintenance of the suction filter 11 is necessary” is displayed on the display device provided in the controller 27.
[0028]
  By the way, in the above, the main maintenance component of the compressor is the suction filter 11 attached to the air intake port of the soundproof cover, and the “state quantity related to the operating state of the compressor” used for determining the replacement time is the cooling fan 14. The two calculation methods in the case of the rotation speed have been described. However, the idea relating to the filter replacement time calculation method can be applied not only to the determination of the maintenance time of the suction filter 11, but also to the determination of the maintenance time of other maintenance components.
[0029]
  More specifically, in order to determine the maintenance time of a maintenance component requiring a compressor, the “state quantity related to the operating state of the compressor” related to the maintenance component is detected directly or indirectly. And the initial value of the service life of the maintenance required parts (L in the above example)₀) And an arbitrary constant (c in the above example) are determined in advance, it is possible to determine the maintenance time of the maintenance parts required for the compressor in a form according to the calculation method 1 described above. Also, the initial value of the service life of maintenance-required parts (in the above example, L₀) And the upper limit of the state quantity (R in the above example)_th) Can be determined in advance in accordance with the calculation method 2 described above, the maintenance time of the maintenance parts required for the compressor can be determined.
[0030]
  For the oil separation element (clogging), the time (h) is taken on the horizontal axis and the differential pressure between the discharge air pressure gauge 22 and the supply air pressure gauge 23 is taken on the vertical axis. This will be described with reference to FIG. The oil separation element 6 is clogged when dust is contained in the discharge air discharged from the compressor body 1, and the differential pressure across the oil separation element 6 increases.
  When the differential pressure increases, the element post-pressure measured by the supply air pressure gauge 23 is controlled to be constant. Therefore, the element pre-pressure detected by the discharge air pressure gauge 22 increases, and the compressor body 1 It becomes overloaded. Therefore, the change with time of the differential pressure can be monitored, and the remaining life of the oil separation element 6 can be calculated from the rising curve of the differential pressure.
[0031]
  A specific calculation method for calculating the remaining life of the oil separation element 6 from the rising curve of the differential pressure is that of the filter replacement timing calculation methods 1 and 2 in which clogging of the suction filter 11 is determined from the rotation speed of the cooling fan 14. Same as the case. That is, the pressure measured by the discharge air pressure gauge 22 is Pd.₂And the pressure measured by the supply air pressure gauge 23 is Pd₃Assuming that the differential pressure D is D = Pd₂-Pd₃In FIG. 3, the differential pressure D is shown by a solid line. In addition, the broken line indicates a curve estimated by Lagrangian interpolation or the like from a plurality of points in the solid line in FIG. 3, as in the case of the broken line in FIG.
[0032]
  The controller 27 calculates the maintenance time of the oil separation element 6 and displays the necessity of the maintenance on display means such as a display device (not shown). The controller 27 is provided with an input switch (not shown). This input switch is used to notify the controller 27 that the maintenance of the oil separation element 6 has been completed and calculation of the next maintenance time is newly started. More specifically, when the oil separation element 6 is first installed and the operation of the compressor is started, the compressor user notifies the controller 27 that the calculation of the maintenance time is newly started. Press the input switch to As a result, the controller 27 newly starts calculating the maintenance time of the oil separation element 6.
[0033]
  Hereinafter, the element replacement time calculation method 1 will be described. The controller 27 includes an initial life value Le of the oil separation element 6.₀Is entered. The elapsed time from the time when the oil separation element 6 is replaced (the time when the input switch is pressed) is t, and the differential pressure when the time t has elapsed is D_tSuppose that Here, if the controller 27 samples the differential pressure n times for each unit time of Δt, the elapsed time t until the sampling is performed n times is t = n × Δt. Further, the life of the oil separation element 6 when t time elapses is Le_tAssuming that, the life Le of the oil separation element 6_tIs(4)It can be calculated with an expression.
  Le_t= Le₀-C'ΣD_iΔtΔt ‥‥‥‥‥‥(4)
  However, the above(4)The lowercase letter c 'in the formula is an arbitrary constant, and the lowercase letter i is an integer from 0 to n. this(4)The life Le of the oil separation element 6 is calculated by calculating the equation_tIs shorter than a predetermined threshold value, the display device of the controller 27 displays that “maintenance of the oil separation element 6 is necessary”.
[0034]
  Next, the element replacement time calculation method 2 will be described. First, as shown by a two-dot chain line in FIG._thIs established. Differential pressure is upper limit D_thTime t to reach_thIs obtained by sampling differential pressure. The oil separation element 6 is replaced with a zero point, the elapsed time from the zero point is t, and the differential pressure after the lapse of t time is D_tSuppose that Here, assuming that the controller 27 has sampled the differential pressure n times per unit time of Δt, the elapsed time t until n times sampling is t = n × Δt. Then, the following(5),(6)According to the formula, the required time Le_thCan be calculated.
[0035]
  Le_th= (D_th-D_{( n-1 ) Δt}) × {Δt / (D_nΔt-D_{( n-1 ) Δt})} + (N−1) Δt
                                                      ‥‥‥‥‥‥(5)
  Further, in the above formula, Le_th≧ Le₀If Le_th= Le₀And then
  D_nΔt≦ D_{( n-1 ) Δt}                                    ‥‥‥‥‥‥(6)
Is used. the above(5),(6)The reason for using the formula is as follows. the above(5)When the maintenance of the oil separation element 6 is necessary only by the formula Le_thIf we try to derive(6)In the case of an expression:(5)Time Le based on the formula_thCannot get a solution for or when Le_thThe value of becomes negative. Therefore, in the above case, as described above, the initial value Le of the life of the oil separation element 6₀Le_thAnd then(6)The formula is used.
[0036]
  Therefore, the controller 27 has elapsed time t and timing Le since the oil separation element 6 was replaced._thAnd when the difference is smaller than a predetermined threshold value, it is determined that it is the replacement time. As a result, the determination result that “maintenance of the oil separation element 6 is necessary” is displayed on the display device.
[0037]
  A filter replacement time calculation method for the oil filter 9 will be described. When the oil filter 9 is clogged, the amount of oil supplied to the compressor body 1 decreases. In the case of an oil-cooled screw compressor, air is cooled with oil, so that the temperature of the discharge air rises when the amount of oil supply decreases. Generally, intake air temperature T_sAnd discharge air temperature T_dAnd oil supply temperature T₀And the refueling amount q have the following relationship.
  q = {W−C₂× Q × (T_d-T_s)} / {C₁× (T_d-T₀)}
  Note that the capital letter Q in the above formula is the air volume (considered as a constant), the capital letter W is the compression power (considered as a constant), and the capital letter C₁And C₂Are constants.
[0038]
  The degree of clogging of the oil filter 9 can be known from the amount of oil supply q in the above equation. That is, the remaining life of the oil filter 9 can be calculated from the oil supply amount q. In this case, the maintenance required part for determining the maintenance time is the oil filter 9, and the “state quantity related to the operating state of the compressor” used for the calculation of the maintenance time is the oil supply amount q.
[0039]
  That is, as described above, the oil supply amount q is set to the suction temperature T._sAnd the discharge temperature T_dAnd oil supply temperature T₀And indirectly detected. Furthermore, if the initial value of the life of the oil filter 9 and an arbitrary constant are determined in advance, the maintenance time of the oil filter 9 can be determined in accordance with the filter replacement time calculation method 1 described above. If the initial value and state quantity of the oil filter 9 and the lower limit value of the oil supply amount q are determined in advance, the maintenance time of the oil filter 9 can be set in accordance with the filter replacement time calculation method 2 described above. Can be determined.
[0040]
  In addition, when determining the maintenance time of the oil filter 9 according to the filter replacement time calculation method 2, the lower limit value is determined instead of determining the upper limit value of the oil supply amount q. Is due to. That is, unlike the case of calculating the maintenance time of the suction filter 11 and the oil separation element 6 in which the rotational speed of the cooling fan 14 increases and the differential pressure increases, the clogging of the oil filter 9 proceeds as time elapses. This is because the amount of oil supply q decreases.
[0041]
  As described above, according to the compressor according to the present embodiment, the maintenance times of the suction filter 11, the oil separation element 6, and the oil filter 9 are obtained as follows.
  (1)The maintenance time of the suction filter 11 is obtained from the increase in the rotation speed of the cooling fan 14 calculated from the rotation speed control signal based on the discharge air temperature measured by the discharge air thermometer 24.
  (2)The maintenance time of the oil separation element 6 is obtained from an increase in the differential pressure between the discharge air pressure measured by the discharge air pressure gauge 22 and the supply air pressure measured by the supply air pressure gauge 23.
  (3)The maintenance timing of the oil filter 9 is based on the relationship between the intake air temperature measured by the intake air thermometer 21, the discharge air temperature measured by the discharge air thermometer 24, and the oil temperature measured by the oil supply thermometer 26. It is obtained from the decrease in the oil flow rate of the oil obtained.
[0042]
  According to the compressor according to the present embodiment, it is possible to reliably determine the maintenance time of the maintenance component requiring operation, and therefore, there are the following effects.
  (1)There is no need to perform maintenance on parts that do not require maintenance, as in the conventional example where maintenance is performed regularly, and there is no waste. This greatly contributes to the reduction of compressor maintenance costs and running costs. There is an excellent effect of being able to.
  (2)In addition to preventing a sudden stop of the compressor due to a sudden failure or the like, it is possible to predict in advance the maintenance timing of the maintenance components requiring. Therefore, there is no disruption to the product manufacturing plan on the production line at the compressed air supply destination, and the product can be manufactured according to the manufacturing plan, so a certain number of products must be delivered on time. Can do.
[0043]
  In the above description, the compressor body is driven by the electric motor whose rotation speed is controlled by the inverter and the discharge amount of the discharge air discharged from the compressor body is described as an example. However, since the present invention can be applied to a compressor that controls the discharge amount of discharge air discharged from the compressor body by a slide valve, the present invention is not limited to the form of the compressor according to the above embodiment. . In the above, various calculation formulas have been shown to calculate the maintenance time and life of various maintenance components. However, the present invention is not limited to the above arithmetic expression.
[0044]
【The invention's effect】
  As described above, the claims of the present invention1Such a compressor, and the claims of the present invention2According to the maintenance method for the compressor, it is possible to obtain an appropriate maintenance time for maintenance components requiring suction such as a suction filter, an oil separation element, and an oil filter by calculation.
  Therefore, there is no need to perform maintenance on parts that do not require maintenance, as in the conventional example where maintenance is performed regularly, which eliminates waste and greatly contributes to the reduction of compressor maintenance costs and running costs. There is an excellent effect that can be done.
[0045]
  Further, the claims of the present invention1Such a compressor, and the claims of the present invention2According to the compressor maintenance method, it is possible to prevent the compressor from being suddenly stopped due to a sudden failure or the like, and in addition, it is possible to predict in advance the maintenance timing of the maintenance components that are required. . Therefore, the product manufacturing plan on the production line at the compressed gas supply destination will not be confused, and the product can be manufactured according to the manufacturing plan. Can do.
[Brief description of the drawings]
FIG. 1 is a schematic configuration explanatory view of a compressor according to an embodiment for carrying out a maintenance method of the present invention.
FIG. 2 is an explanatory diagram of a change in the number of rotations of the cooling fan over time, with time (h) on the horizontal axis and the rotation speed (rpm) of the cooling fan on the vertical axis according to the embodiment of the present invention. .
FIG. 3 relates to the embodiment of the present invention, and explains the change over time in differential pressure, with time (h) on the horizontal axis and differential pressure between the discharge air pressure gauge and the supply air pressure gauge on the vertical axis. FIG.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 1 ... Compressor body, 2 ... Electric motor, 3 ... Suction port, 4 ... Discharge port, 5 ... Oil separation recovery device, 6 ... Oil separation element, 7 ... Oil reservoir part, 8 ... Oil cooler, 9 ... Oil filter, DESCRIPTION OF SYMBOLS 10 ... Suction flow path, 11 ... Suction filter, 12 ... Discharge flow path, 13 ... Oil flow path, 14 ... Cooling fan, 15 ... Inverter, 20 ... Compressor control apparatus, 21 ... Suction air thermometer, 22 ... Discharge air Pressure gauge, 23 ... Supply air pressure gauge, 24 ... Discharge air thermometer, 25 ... Motor thermometer, 26 ... Refueling thermometer, 27 ... Controller.

Claims (2)

In a compressor which is an oil-cooled compressor having an oil flow path provided with an oil filter and provided with a compressor main body, an operating state amount detecting means for detecting an operating state amount related to the operating state of the compressor is provided. The operation state quantity detecting means is provided on the suction side of the compressor main body with a function of calculating a predetermined maintenance timing of the required maintenance component based on the operation state quantity detected by the operation state quantity detection means. A suction thermometer provided, a discharge thermometer provided on the discharge side of the compressor body, and an oil supply thermometer provided in the oil flow path, wherein the operating state quantity is detected by the suction thermometer Based on the temperature T _s , the discharge temperature T _d detected by the discharge thermometer, and the oil supply temperature T ₀ detected by the oil supply thermometer , the oil flowing through the oil flow path obtained by the following equation is an oil flow rate q, before Main maintenance parts compressor, characterized in that said oil filter.
Expression: q = {W−C ₂ × Q × ( T _d −T _s ) } / {C ₁ × ( T _d −T ₀ ) }
W, Q, C ₁ and C ₂ in the above formula are constants. Comprising a compression machine body, the oil filter measures the operation state quantity relating to the operating state of the compressor is an oil-cooled compressor having an oil passage which is interposed, on the basis of the measured operation state quantity needed Te maintenance method smell of the compressor to determine the predetermined maintenance time of maintenance parts, wherein the operation state quantity and the suction temperature T _s detected by the suction temperature thermometer provided on the suction side of the compressor body, said compressor a discharge temperature T _d which is detected by the discharge thermometer provided on the discharge side of the main body, based on the oil temperature T ₀ to be detected by the fueling thermometer provided in the oil passage, determined by the following formula wherein an oil flow rate q of oil flowing through the oil flow passage, maintenance method compressors you, wherein the predetermined maintenance is maintenance of the oil filter to be.
Expression: q = {W−C ₂ × Q × ( T _d −T _s ) } / {C ₁ × ( T _d −T ₀ ) }
W, Q, C ₁ and C ₂ in the above formula are constants.

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